package com.controller;


import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.domain.UserInfo;

/**
 * 登录过滤器
 * 
 * 通过session判断，如果为空，则跳转到登录页面
 * 
 * @author Roman
 * 
 */

@WebFilter(urlPatterns = { "/view/*"})
public class LoginFilter implements Filter {

	public LoginFilter() {

	}

	public void init(FilterConfig fConfig) throws ServletException {

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse resp = (HttpServletResponse) response;
		HttpSession session = req.getSession();
		UserInfo userInfo = (UserInfo) session.getAttribute("userInfo");
		if (userInfo == null) {
			resp.sendRedirect("../index.jsp");
		} else {
			chain.doFilter(request, response);
		}
	}

	public void destroy() {

	}

}
